package round84;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * User: Samuel
 * Date: 08-29-11
 * Time: 10:26 AM
 */
public class B {
    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(in.readLine());
        StringBuilder sb = new StringBuilder();
        char array[] = "abcd".toCharArray();
        for (int i = 0; i < n; i++) {
            sb.append(array[i % 4]);
        }
        System.out.println(sb.toString());
    }
}
